Finding the Fourth Proportional to 21,177.18, 29,220.75 and 13,218.12
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Solution
The fourth proportional to 21,177.18, 29,220.75 and 13,218.12 is: 18,238.66
Step by Step Solution
- Step 1: Write the proportion equation
21,177.18 : 29,220.75 = 13,218.12 : x - Step 2: Convert to fraction form
21,177.18/29,220.75 = 13,218.12/x - Step 3: Cross multiply
21,177.18x = 29,220.75 × 13,218.12 - Step 4: Simplify right side
21,177.18x = 386,243,379.99 - Step 5: Solve for x
x = 386,243,379.99/21,177.18 - Step 6: Final answer
x = 18,238.66
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Double scale
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.